Year	% net
1998	93.4861
1999	92.81695
2000	92.84749
2001	93.65097
2002	92.95945
2003	92.86134
2004	92.6861
2005	92.30741
2006	92.42654
2007	92.85786
2008	92.15471
2009	92.66448
2010	92.92732
2011	92.86517
2012	92.9377
2013	92.65548
2014	92.35341
2015	91.96324
2016	91.31979
2017	91.3643